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The factors of 57 are 1, 3, 19, and 57.

The factors of 76 are 1, 2, 4, 19, 38, and 76.

The common factors are 1 and 19. Therefore, the greatest common factor is 19.

The greatest common factor can also be determined from the prime factors.

The prime factors of 57 are 3 and 19.

The prime factors of 76 are 2, 2, and 19.

The common prime factors are a single 19, so the greatest common factor is 19. The answer is 19. The GCF is 19.
The greatest common factor of the numbers 57 and 76 is 19.

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Q: What is the greatest common factor of 57 and 76?
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